Airplane seat



FIG. 1 is a front perspective view of the claimed design;

FIG. 2 is a back elevation view of the claimed design;

FIG. 3 is a front elevation view of the claimed design;

FIG. 4 is a top plan view of the claimed design;

FIG. 5 is a left side elevation view of the claimed design; and,

FIG. 6 is a right side elevation view of the claimed design.

The broken lines illustrate portions of the airplane seat that form no part of the claimed design. 

CLAIM The ornamental design for an airplane seat, as shown and described. 